US8129048B2 - Method for producing rectangular flat secondary battery - Google Patents
Method for producing rectangular flat secondary battery Download PDFInfo
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- US8129048B2 US8129048B2 US11/919,505 US91950507A US8129048B2 US 8129048 B2 US8129048 B2 US 8129048B2 US 91950507 A US91950507 A US 91950507A US 8129048 B2 US8129048 B2 US 8129048B2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0436—Small-sized flat cells or batteries for portable equipment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0468—Compression means for stacks of electrodes and separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/36—Accumulators not provided for in groups H01M10/05-H01M10/34
- H01M10/38—Construction or manufacture
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/60—Selection of substances as active materials, active masses, active liquids of organic compounds
- H01M4/602—Polymers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/147—Lids or covers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/661—Metal or alloys, e.g. alloy coatings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49108—Electric battery cell making
- Y10T29/4911—Electric battery cell making including sealing
Definitions
- the present invention relates to a method for producing a rectangular flat secondary battery with excellent stability in battery properties and high capacity.
- nonaqueous electrolyte secondary batteries such as nickel cadmium battery, nickel-metal hydride battery, small sealed lead acid storage battery and the like have come into use as a power supply for driving electric appliances.
- a positive electrode plate and a negative electrode plate are spirally wound with a separator interposed therebetween to form an electrode group in general.
- Patent Reference 1 a technique in which a concave portion is formed in a long side surface of an armoring can is proposed. Specifically, by forming a concave portion in a long side surface of an armoring can, an internal pressure applied to the long side surface is uniformed and thus swelling in the long side surface of the armoring can prevented.
- Patent Reference 2 a method in which an elastic body is inserted in a winding core hole after removal of a winding core is proposed.
- the elastic body inserted in the winding core hole applies a pressure to an electrode group to prevent deflection of the electrode group toward the winding core hole is prevented, so that increase in internal resistance is prevented.
- the member inserted in the winding core hole is an elastic body and the elastic body has the function of absorbing swelling of the electrode group. Therefore, swelling of an armoring can be prevented as well.
- Patent Reference 2 in which an elastic body is inserted in a winding core hole is excellent in the point of preventing increase in internal resistance due to deflection of an electrode plate.
- a compound of Si, Sn or the like for example, SiO, TiSi 2 or the like
- An active material made of a compound of Si or the like has a larger theoretical capacity than that of a carbon material such as graphite and therefore it is suitable to such active materials to increase a capacity of a battery.
- a carbon material such as graphite
- such an active material largely expands and shrinks. Therefore, the increase in internal resistance or variation is caused as a result of increase in the degree of swelling of the electrode group, and thus the problem of swelling of deflection of an electrode plate again has become notable.
- the present invention has been devised and it is therefore an object of the present invention to provide a method for manufacturing a high capacity rectangular flat secondary battery in which increase in internal resistance of the battery is suppressed.
- the present inventors focused on an assembly step for a rectangular flat battery as a reason why increase and variation in internal resistance occur even when an elastic body is inserted in a winding core hole of an electrode group.
- a rectangular flat battery is assembled in the following manner.
- a positive electrode plate and a negative electrode plate are spirally wound with a separator interposed therebetween to form an electrode group having a circular or oval shape, the electrode group is compressed to be deformed into a flat shape, and then the flat electrode group is accommodated in a rectangular flat armoring can with a base, thereby assembling a rectangular flat battery.
- the electrode group is not spirally wound in a constant state because of variations in winding pressure and the like, a compression pressure to be applied to each member of the electrode group might vary. In such a case, an excessive compression pressure is locally applied to the electrode group, thus the electrode group might be possibly deflected in part to which an excessive compression pressure is applied.
- deflection in charging/discharging deflection in charging/discharging
- initial deflection deflection of an electrode plate caused by compression of an electrode group in an assembly step
- the electrode plate deflection is promoted with the initial deflection as a starting point, so that internal resistance is increased or varies.
- the electrode plate deflection can not be suppressed only by the known method in which an elastic body is inserted in a winding core hole.
- the initial deflection of an electrode plate has not been considered at all.
- the present inventors believed that to reduce increase and variation in internal resistance, it is necessary to prevent the generation of the initial deflection of an electrode plate.
- the present inventors adopted a method in which with a center core member for applying a pressure (i.e., force working in the direction to expand a winding core hole) inserted in an electrode group, the electrode group is compressed and deformed into a flat shape.
- a method for producing a rectangular flat secondary battery is characterized by including the steps of: a) spirally winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween, thereby forming an electrode group having a circular shape or an oval shape; b) inserting a center core member for applying a pressure to the electrode group in a winding core hole of the electrode group; c) compressing the electrode group to deform the electrode group into a flat shape; d) accommodating the flat electrode group in a rectangular flat armoring can with a base; and e) sealing an opening portion of the armoring can.
- a center core member for applying a pressure to an electrode group is inserted, so that initial deflection of an electrode plate, which conventionally occurs when the electrode group is compressed, can be prevented.
- increase or variation in internal resistance due to repetition of a charge and discharge cycle can be suppressed.
- a negative electrode substance formed on the negative electrode plate is made of a compound containing at least one of Si and Sn.
- the center core member is made of an elastic body having a plate shape and a Young's modulus of 2.0 ⁇ 10 ⁇ 3 GPa or more.
- the electrode group is compressed and deformed into a flat shape.
- the occurrence of deflection of an electrode plate in compressing the electrode group can be prevented. Accordingly, a high capacity rectangular flat secondary battery in which increase in internal resistance of the battery is suppressed can be achieved.
- FIG. 1(A) is a schematic view illustrating a structure of an electrode group according to an embodiment of the present invention.
- FIG. 1(B) is a schematic view illustrating a structure of a rectangular flat secondary battery in which an electrode group is inserted in an armoring can.
- FIG. 1(C) is a cross-sectional view taken along the line a-a of FIG. 1(B) .
- FIG. 2 is a cross-sectional view illustrating an exemplary structure of a center core member according to an embodiment of the present invention.
- FIG. 3 is a cross-sectional view illustrating another exemplary structure of a center core member according to an embodiment of the present invention.
- FIG. 4 is a table showing evaluation results for internal resistance in each of embodiments of the present invention.
- FIG. 1(A) is a schematic view illustrating an electrode group 3 deformed into a flat shape according to this embodiment.
- FIG. 1(B) is a schematic view illustrating a rectangular flat secondary battery in which the electrode group 3 is inserted in an armoring can (case) 4 .
- FIG. 1(C) is a cross-sectional view taken along the line a-a of FIG. 1(B) .
- a rectangular flat secondary battery is produced in the following steps. First, a positive electrode plate and a negative electrode plate are spirally wound with a separator interposed therebetween to form an electrode group 3 having a circular shape or an oval shape. Next, a center core member 2 for applying a pressure to the electrode group 3 is inserted in a winding core hole 6 of the electrode group 3 . Thereafter, the electrode group 3 is compressed and thereby is deformed into a flat shape. Then, the flat electrode group 3 is accommodated in a rectangular flat armoring can 4 with a base and, finally, an opening portion of the armoring can 4 is sealed, thereby completing a rectangular flat secondary battery.
- a positive electrode lead 3 a and a negative electrode lead 3 b are connected to the positive electrode plate and the negative electrode plate of the electrode group 3 , respectively.
- one of the positive electrode lead 3 a and the negative electrode lead 3 b is connected to a terminal 5 of the armoring can 4 and the other is connected to the armoring can 4 .
- an electrolyte is injected thereinto through an injection hole 1 a and then the opening portion of the armoring can 4 is sealed with a sealing plate 1 .
- the center core member 2 for applying a pressure to the electrode group 3 is inserted in the winding core hole 6 of the electrode group 3 .
- a negative electrode active material formed on the negative electrode plate is made of a compound containing at least one of Si and Sn, thereby preventing the occurrence of initial deflection of an electrode plate even when expansion and shrinkage of its volume which occur along with charge and discharge of the battery.
- deflection of an electrode plate in charging/discharging is not promoted and the effect of suppressing increase and variation in internal resistance according to the present invention can be more remarkably exhibited.
- a compound containing Si, SiO x (0.05 ⁇ x ⁇ 1.95), an alloy, a compound, a solid solution or the like of Si or SiO x in which part of Si is replaced with an element such as B, Mg, Ni, Ti, Mo, Co, Ca, Cr, Cu, Fe, Mn, Nb, Ta, V, W, Zn, C, N or Sn can be used.
- an alloy, a compound, a solid solution or the like of Si or SiO x in which part of Si is replaced with an element such as B, Mg, Ni, Ti, Mo, Co, Ca, Cr, Cu, Fe, Mn, Nb, Ta, V, W, Zn, C, N or Sn can be used.
- a compound containing Sn, Ni 2 Sn 4 , Mg 2 Sn, SnO x (0 ⁇ x ⁇ 2), SnO 2 , SnSiO 3 , LiSnO or the like can be used.
- the center core member 2 to be inserted in the winding core hole 6 of the electrode group 3 is made of a plate-shape elastic body having a Young's modulus of 2.0 ⁇ 10 ⁇ 3 GPa or more.
- center core member 2 there is no particular limitation for the center core member 2 to be inserted in the winding core hole 6 of the electrode group 3 , and a shape, a material and the like can be appropriately selected for the center core member 2 within a range which exhibits the effects of the present invention.
- the effects of the present invention can be appropriately exhibited by using the following shape and material for the center core member 2 .
- a material for example, polyvinylidene fluoride (PVDF), styrene-butadiene copolymer (SBR), acrylonitrile butadiene styrene copolymer and the like
- PVDF polyvinylidene fluoride
- SBR styrene-butadiene copolymer
- acrylonitrile butadiene styrene copolymer and the like which absorbs an electrolyte and swells.
- Such a material has a Young's modulus of 2.0 ⁇ 10 ⁇ 3 GPa or more and thus the occurrence of deflection of an electrode plate in compressing the electrode group 3 can be prevented.
- such a material absorbs an electrolyte and swells after the electrode group 3 has been accommodated in the armoring can 4 , and thus the occurrence of deflection of an electrode plate in charging/discharging can be effectively suppressed.
- a plate-shape elastic body may be formed to have a wedge shape. If the center core member 2 has such a wedge shape, the center core member 2 can be easily inserted in the winding core hole 6 . Also, as shown in FIG. 3 , a length of a straight line L (which is part serving to expand the winding core hole 6 of the electrode group 3 ) of the wedge shape is preferably 50% or more of the entire length (in the axis direction of the winding core hole 6 ) of the center core member 2 .
- the elastic body When the center core member 2 is made of a plate-shape elastic body, the elastic body preferably has a Young's modulus not exceeding 210 GPa. If the elastic body has a larger Young's modulus than 210 GPa, the elastic body does not absorb swelling of an electrode group and thus an armoring can might swell. Therefore, an elastic body having a larger Young's modulus than 210 GPa is not preferable.
- the center core member 2 may be formed of an elastic body with a C-shape.
- the center core member 2 may be configured to include a member having springs 2 a for applying a pressure to the electrode group 3 .
- the center core member 2 having one of the above-described configurations serves to expand the winding core hole 6 of the electrode group 3 and the effects of the present invention can be achieved.
- the center core member 2 preferably has a width corresponding to 80% or more of a width of the winding core hole 6 of the electrode group 3 in the flattening direction.
- a positive electrode mixture including lithium cobaltate as an active material, PVDF as a binder and acetylene black as a conducting agent was applied to an aluminum foil as a current collector and dried.
- the positive electrode mixture dried on the aluminum foil was rolled and then was cut so as to have a width of 29.5 mm. Thus, a hoop of a positive electrode plate was obtained.
- a negative electrode mixture including artificial graphite as an active material, SBR as a binder and carboxymethyl cellulose as a thickener was applied to a copper foil as a collector and dried.
- the negative electrode mixture dried on the copper foil was rolled and then was cut so as to have a width of 30.6 mm. Thus, a hoop of a negative electrode plate was obtained.
- LiPF 6 1M of LiPF 6 was dissolved in a nonaqueous mixed solvent containing ethylene carbonate, ethyl methyl carbonate and diethyl carbonate (in a volume ratio of 3:5:2), thereby preparing an electrolyte.
- the positive electrode plate hoop and the negative electrode plate hoop were cut so that each of the hoop has a predetermined length, and were used as a positive electrode plate and a negative electrode plate, respectively.
- a mixture layer on each of the positive electrode plate and the negative electrode plate was partially removed and a positive electrode lead 3 a and a negative electrode lead 3 b were connected.
- a separator having a thickness of 20 ⁇ m and made of a polyethylene resin microporous membrane sheet was provided between the positive electrode plate and the negative electrode plate.
- the positive electrode plate, the negative electrode plate and the separator all together were spirally wound to form an electrode group 3 (with a theoretical capacity of 700 mAh) of FIG. 1(A) , having an oval spirally wound shape with a length of 33.5 mm, a width of 32.7 mm and a thickness of 4.25 mm.
- a center core member 2 (with a length of 30 mm, a width of 26.4 mm, a thickness of 0.3 mm and a Young's modulus of 210 GPa) formed of spring steel having a thickness of 0.1 mm and an approximately C-shape was inserted in a winding core hole 6 of the electrode group 3 , as shown in FIG. 1(C) .
- the electrode group 3 was compressed and accommodated in an aluminum case with a length of 34.6 mm, a width of 33.1 mm and a thickness of 4.6 mm and the case 4 and a sealing plate 1 were welded and sealed by laser. Then, the electrolyte in an amount of 1.9 g was injected therein through an injection hole 1 a of the sealing plate 1 and the injection hole was closed, thereby completing a rectangular flat lithium ion secondary battery of FIG. 1(B) .
- electrode leads 5 a and 5 b were welded so as to be connected to the sealing plate 1 and a terminal 5 , respectively, before closing the injection hole by laser.
- the center core member 2 In contrast to Working Example 1, as a material of the center core member 2 , PVDF (with a Young's modulus of 2.0 ⁇ 10 ⁇ 3 GPa) was used. Furthermore, the center core member 2 was formed so as to have the same dimensions as those in Working Example 1 but have a plate-shape. Other than that, a lithium ion secondary battery was produced in the same manner as in Working Example 1.
- the center core member 2 was formed so as to have the same dimensions as those in Working Example 1 but has a structure of FIG. 2 including springs 2 a .
- a lithium ion secondary battery was produced in the same manner as in Working Example 1.
- SiO coating carbon fiber was used as a negative electrode active material and polyacrylic acid was used as a binder for the negative electrode plate.
- a lithium ion secondary battery was produced in the same manner as in Working Example 1.
- a bag made of a laminated resin film was used to seal the opening thereof by thermally welding.
- a lithium ion secondary battery was produced in the same manner as in Working Example 1.
- a “rectangular flat secondary battery” refers to a battery having a structure in which a spirally wound electrode group is compressed and deformed into a flat shape and then accommodated in an armoring can and is not defined by a shape of an armoring can itself.
- the present invention is useful for a high capacity rectangular flat secondary battery in which increase in internal resistance the battery was suppressed.
Abstract
Description
- Patent Reference 1: Japanese Laid-Open Publication No. 2002-042741
- Patent Reference 2: Japanese Laid-Open Publication No. H8-055637
Claims (8)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP2006-043367 | 2006-02-21 | ||
JP2006043367 | 2006-02-21 | ||
PCT/JP2007/051702 WO2007097172A1 (en) | 2006-02-21 | 2007-02-01 | Method of manufacturing square flat secondary battery |
Publications (2)
Publication Number | Publication Date |
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US20090077794A1 US20090077794A1 (en) | 2009-03-26 |
US8129048B2 true US8129048B2 (en) | 2012-03-06 |
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Application Number | Title | Priority Date | Filing Date |
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US11/919,505 Expired - Fee Related US8129048B2 (en) | 2006-02-21 | 2007-02-01 | Method for producing rectangular flat secondary battery |
Country Status (5)
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US (1) | US8129048B2 (en) |
JP (1) | JPWO2007097172A1 (en) |
KR (1) | KR20080095166A (en) |
CN (1) | CN101356685A (en) |
WO (1) | WO2007097172A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US20090077794A1 (en) | 2009-03-26 |
JPWO2007097172A1 (en) | 2009-07-09 |
KR20080095166A (en) | 2008-10-28 |
CN101356685A (en) | 2009-01-28 |
WO2007097172A1 (en) | 2007-08-30 |
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